下面是一张众所周知的淘宝购物车页面,今天要讲解的案例就是用vue.js做一个类似的页面

首先简单介绍一下可能会用到的一些vue.js的用法:

v-bind,绑定属性;例如v-bind:class="{'class1':flag}",这是常用的绑定样式的方法,如果flag为true则class=class1;v-bind:src="image",image就是图像的路径;

v-if="flag"与v-show="flag",如果flag为true,则绑定的为“可见”,不同的是v-show是一开始就渲染在DOM中的,改变的则是它的display而已,而v-if为false则是从HTML代码中移除;

v-on:或@,样式绑定v-on:click="dosomething()"或者@click="dosomething()",点击触发dosomething函数;

v-for循环,v-for="item in items",items为数组,item为items数组的值而不是索引;

要注意的是当this作用域的改变:当this作用域改变是我们设置var self = this,在之后的使用中用self代替;

下面是HTML代码:

<html>
    <head>
        <title>购物车</title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
       <link rel="stylesheet" type="text/css" href="shop.css">
    </head>
    <body>
        <div id="app">
            <div class="header"><span style="margin-left: 75px;">商品</span><span style="margin-left: 70px;">单价</span><span style="margin-left: 35px;">数量</span><span style="margin-left: 40px;">总价</span></div>
            <div v-for="item in goods">
            <div class="show" v-show="item.selected">
                <span class="choice" v-bind:class="{'checked':item.checked}" @click="check(item)"></span>
                <div style="float:left;margin-left: 20px;"><img v-bind:src="item.image" v-bind:alt="item.alt" class="image"/><span class="text">{{item.name}}</span></div>
                <span style="float:left;margin-left: 20px;margin-top:20px;width:40px;">{{item.price}}元</span>
                <div style="float:left;margin-left: 30px;margin-top: 20px;">
                    <span v-on:click="changeNum(item,-1)"><a href="javascript:void(0)">-</a></span>
                    <input v-model="item.number" class="output" disabled/>
                    <span v-on:click="changeNum(item,1)"><a href="javascript:void(0)">+</a></span>
                </div>
                <div style="float:left;margin-left: 30px;margin-top: 25px;width:51px;">¥{{item.price * item.number}}元</div>
                <span class="icon" @click="seen=true"></span>
            </div>
            </div>
            <!--footer-->
            <div id="footer">
            	<span class="choice" style="margin-top:18px;" v-bind:class="{'checked':checkAllFlag}"></span>
                <a href="javascript:void(0)" @click="checkAll(true)">全选</a>
                <a href="javascript:void(0)" style="color:;" @click="checkAll(false)">取消全选</a>
                <span style="display:inline-block;margin-left:70px;width:95px;">Total:¥{{totalAll}}元</span>
                <span><button class="count">结&nbsp;算</button></span>
            </div>      
            <div id="info" v-show="seen">
            	<p style="margin-top:20px;">是否删除该商品?</p><div class="close" @click="seen=false">&times</div>
            	<button class="get" style="padding-left:10px;" @click="">yes</button><button class="get" style="margin-left:20px;" @click="seen=false">no</button>
            </div>   
            <div class="shadow" v-show="seen"></div>  
        </div>
    </body>
    <script src="./src/vue.min.js"></script>
    <script src="./src/vue-resource.min.js"></script>
    <script src="shop.js"></script>
</html>

下面的是js的代码:

var vm = new Vue({
        el:'#app',
        data:{
            total: 0,
            totalAll: 0,
            goods: [],//商品为数组
            checkAllFlag: false,
            seen: false,
            delFlag: true
        },
        mounted: function () {
            this.goodlist();
        },
        methods:{
            //改变商品数量
            changeNum:function (item,flag) {
                            if (flag>0) {
                                item.number++;
                                }else{
                                	item.number--;
                                	if(item.number<1){
                                		item.number = 1;
                                	}       
                                  }
                            this.totalMoney();
            },
            //是否选中
            check:function (item) {
            	if(typeof item.checked == 'undefined'){
            		this.$set(item,"checked",true);
                    //局部为item添加“checked”,值为true
            	}else{
            		item.checked = !item.checked;
            	}
            	this.totalMoney();
            },
            //通过$http.get方法ajax地交互获取商品信息,一定要引入vue-resource组件
            goodlist:function () {  
                var self = this;
                this.$http.get("shop.json").then(function (res) {
                    self.goods = res.data.result.goods;
                },function () {
                    console.log("failed");
                });
            },
            //是否全选
            checkAll:function (flag) {
            	this.checkAllFlag = flag;
            	var self = this;
            		this.goods.forEach(function(value,index){
            			if(typeof value.checked == 'undefined'){
                    		self.$set(value,"checked",self.checkAllFlag);
                    	}else{
                    		value.checked = self.checkAllFlag;
                    	}
            		});
            	this.totalMoney();
            },
            //结算选中商品的价格
            totalMoney:function () {
                //初始化总价
            	this.totalAll = 0;
            	var self =this;
                //通过foreach循环判断是否被选中
            	this.goods.forEach(function(value,index){
            		if(value.checked){
            			self.totalAll += value.price * value.number;
            		}
            	});
            }      
        }
    })

下面是CSS代码:

*{padding: 0;margin: 0;}
a{text-decoration: none;color: black;}
#app{width: 500px;height: 600px;border: 1px solid;position: absolute;margin-top:20px;margin-left:50px;}
.header{width: 500px;height: 30px;line-height: 30px;background-color: darkmagenta;}
.header span{display: inline-block;width: 50px;height: 30px;}
.show{width: 500px;height: 85px;margin-top: 5px;}
#footer{position: absolute;bottom: 0;width: 500px;height: 50px;background-color: #c7c7c9;}
.output{width: 40px;height: 20px;}
.image{width: 60px;height: 80px;float:left;}
.choice{display: inline-block;width: 15px;height: 15px;border-radius: 15px;border: 1px solid;float: left;margin-top: 30px;margin-left: 20px;}
.checked{background-color: darkorange;}
.icon{background-image: url(del.png);display: inline-block;width: 30px;height: 30px;margin-left: 50px;margin-top: 20px;}
.text{display:inline-block;width:50px;height:20px;line-height:20px;font:12px;margin-top:20px;margin-left:5px;float:left;}
.count{width:100px;height:40px;background-color:red;line-height:40px;font-size:16px;margin-left:40px;margin-top:5px;}
#footer a{display:inline-block;margin-left:5px;height:22px;}
#info{width:250px;height:100px;position:absolute;border:1px solid;margin-top:-250px;margin-left:120px;background-color:#c7c7c9;text-align:center;z-index:999;}
.get{width:80px;height:30px;font:17px;margin-top:10px;}
.shadow{width:100%;height:100%;background-color:black;opacity:0.8;margin-top:-480px;z-index:1;}
.close{position:absolute;right:2px;top:-5px;cursor:pointer;}

下面是json代码:

{
	"status":1,
	"result":{
		"total":50,
	    "goods":[
	        {
	            "name":"香烟",
	            "price":15,
	            "number":1,
	            "selected": true,
	            "image": "./img/xiangyan.jpg",
	            "alt": "香烟"
	        },
	        {
	            "name": "啤酒",
	            "price": 12,
	            "number": 1,
	            "selected": true,
	            "image": "./img/pjiu.jpg",
	            "alt": "啤酒"
	        },
	        {
	            "name": "打火机",
	            "price": 2,
	            "number": 1,
	            "selected": true,
	            "image": "./img/fire.jpg",
	            "alt": "打火机"
	        },
	        {
	            "name": "鸡腿",
	            "price": 5,
	            "number": 1,
	            "selected": true,
	            "image": "./img/chick.jpg",
	            "alt": "鸡腿"
	        },
	        {
	            "name": "垃圾袋",
	            "price": 8,
	            "number": 1,
	            "selected": true,
	            "image": "./img/bush.jpg",
	            "alt": "垃圾袋"
	        }
	    ]
    },
    "message":""
}

实现的结果如下图:

代码下载:https://github.com/createor/vue/raw/master/vue.zip

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